GoPro Had Which Promotion Problem When the Drone Was Postponed

GoPro had which promotion problem when the drone was postponed in the spring of 2016 and customers defected?

A) The company had promoted expectations to meet customer's communication needs, and these expectations were not met.
B) The company had promoted the product by the customers did not understand what was being communicated.
C) The company was promoting a product but failed to communicate what the customers needed to know.
D) The company promoted a product and unknowingly promoted competitors' products to the customers.